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1 When the burner of a stovetop is very hot, it is a source of heat energy. 2  Anything placed onto the stovetop and warmed, whether a pot of tea or a skillet for frying eggs, also become sources of heat energy. 3  Automobile fuels such as gasoline are sources of heat energy, as is the hot engine of a racecar or a school bus.
â¢ Heat Is a form of energy transferred by a difference in temperature. â¢ Heat transfer can occur, when there is a temperature difference between two or more objects. Heat will only flow from a warm object to a colder object. â¢ The heat transfer is greatest, when there is a large temperature difference between two objects.difference between two objects.